Thermostat for automatic fire-alarms.



W= PRYOR.

THERMOSTAT FOR AUTOMATIC FIRE ALARMS.

APPLICATION FILED MAYZE). 1917.

Patented Nov. 12, 1918 2 SHEETS-SHEET l.

I 514 rue l l 50 .M/Z Zberi Pryor C WM Fig-Q7 lilStTf-tou may S W. PRYOR.

THERMOSTAT FOR AUTOMATIC FIRE ALARMS.

APPLICATION FILED MAY 29. 1917.

1,284,451. Patentd Nov. 12,1918.

2 SHEETSSHEE T 2- 97 whim V 1%49 Wa'ibe/ i Pryor UNITED STATES PATENT OFFICE.

WILBERT PRYOR, OF CONDON, OREGON.

Application filed May 29,1917.

To all whom it may concern:

Be it known that I. WVILBERT Peron, a citizen of the United States, residing at Condon, in the county of Gilliam and State of Oregon, have invented certain new and useful Improvements in Thermostats for Automatic Fire-Alarms, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a thermostat for an automatic fire alarm and has for its object the production of a simple and etlicient alarm which may be readily and conveniently attached to the wall, ceiling or other support within a room or dwelling for automatically sounding the alarm if the temperature within the room or dwelling rises beyond a predetermined temperature.

Another object of this invention is the production of a simple and efficient alarm which consists of a minimum number of parts and which will eificiently operate.

With these and other objects in view, this invention consists of certain novel combinations, constructions and arrangements of parts as will be hereinafter more fully described and claimed.

In the drawings:

Figure 1 is a front elevation of the preferred form of the automatic fire alarm.

Fig. 2 is a section taken on line 22 of Fig. 1. t

Fig. 3 is a section taken on line 33 of Fig. 1, looking in the direction of the arrow.

Fig. 4 is a section taken on line l4.0f Fig. 1.

Fig. 5 is a section taken on line 5-5 of Fig. 1.

Fig. 6 is a detail perspective of the lever supporting arm.

Fig. 7 is a section taken on line 77 of Fig. 1. I

Fig. 8 is a front elevation of a modified form of the present invention.

Fig. 9 is an end elevation of the structure shown in Fig. 8.

Fig. 10 is a detail perspective of the stationary contact bracket.

Fig. 11 is a detail perspective of the movable contact bracket.

'By referring to the drawings. it will be seen that 1 designates the body of the alarm upon which is mounted a gage rack 2, which gage rack is provided with a plurality of flattened feet 3 for facilitating the securing of the gage rack 2 to the body or support 1.

Specification of Letters Patent.

THERMOSTAT FOR AUTOMATIC FIRE-ALARMS.

Patented Nov. 12, 1918.

Serial No. 171,758. I

A. thermometer a is supported upon the body or support 1 by means of the bracket and a reciprocating plunger 6 is slidably mounted in the upper end of the thermometer 4 and is adapted to be raised and lowered in accordance with the expansion and contraction of the mercury positioned within the thermometer 1. The upper end of the plunger 6 is connected to the slotted end of the primary operating lever 7 which primary operating lever 7 is pivotally supported upon an adjustable lever supporting bracket 8. The opposite end of the lever arm 7 is pivotally connected to the circuit closing arm 9, and this circuit closing arm 9 is supported upon the standard 10, which standard 10 is carried by the lever supporting bracket 8. The standard 10, however, is insulated from the bracket 8 by passing through the insulated spool 11 carried by the bracket 8, as illustrated in Fig. 4 of the drawings. The lever supporting arm 8 is provided with an eye 12 at one end thereof, through which eye 12 passes the gage rack 2. A thumb screw 13 passes through the eye 12 for firmly holding the lever supporting bracket 8 in an adjusted position upon the gage rack 2. The gage rack 2 is formed of an upper section having its lower end 14: fitting into the socket 15 of the lower section 16 thereof in order to permit the bracket 8 to be placed thereover as well as the adjustable contact arm 17.

The adjustable contact arm 17 is slidably mounted upon the gage rack 2 and is provided with a projecting contact finger 18, which projecting contact finger 18 is adapted to be engaged by the circuit closing arm 9 as the lever arm 7 is swung. An indicating point 20 is carried by the opposite contact arm 17 in order to permit the arm to be adjusted to the proper position upon the body or support 1. side of the gage rack 2 as illustrated in Fig.

A gage 21 is arranged to the 1 to permit the gage arm 17 as well as the the wire 26. The bell box is also electrically connected to the battery 24 by means of the wire 27. A wire 28 passes from the battery 24 up through the socket 29 formed in the rear face of the body 1 and passes out through the aperture 30 formed in the body 1 and is coiled at 31 as illustrated in Fig. 1. The coiled end 31 of the wire 38 is connected to the contact finger 18 of the adjustable contact arm 17 The circuit closing arm 9 is insulated from the primary lever arm 7 by means of an insulated spool 32 through which the securing rivet 33 passes. By carefully considering Fig. 6, it will be seen that a spacing lug 34 is formed upon the inner face of the bracket 8 to hold the bracket in proper alinement while the same is being adjusted vertically upon the gage rack 2. This spacing lug 34is also clearly illustrated in Fig. 5 of the drawings.

In Figs. 8, 9, 10 and 11 there is shown a modification of the present invention Wherein a supporting block or body 35 is employed upon which is mounted a gage rack 36 similarly constructed to the gage rack 2 above described. This rack 36 comprises a plurality of sections, one end of one section fitting into a socket 37 formed in the adjoining section to permit the adjustable contact member 38 to be placed upon the gage rack 36. This adjustable contact member 38 comprises a body portion which is slidably mounted upon the gage rack 36 and is held in a set position by means of the thumb screw or binding screw 39 passing through the adjustable contact member 38. An indicating point 40 is formed upon the adjustable contact member'38 to permit the contact member 38 to be adjusted to a proper adjustment from the indicating gage 41 formed upon the face of the block 35 as is shown clearly in Fig. 8 of the drawings. The ad j ustable contact member 38 is provided with an upwardly extending looped expansion spring 42 which is adapted to expand and contract as the temperature of the atmosphere surrounding the same varies. A stationary contact member 43 is carried by the front face of the supporting block 35 and this stationary contact member 43 is provided with an upwardlv projecting lip 44 terminating in a forwardly extending tongue 45 with which tongue is adapted to contact the outer end 46 of the expansible spring 42. r

A battery supporting housing 47 is secured to the lower end of the block 35 and a battery 48 is placed therein. The gage rack 36 is electrically connected to the bells supported upon the bell box 49 by means of a wire 50 and the bell box is in turn electrically connected to the battery 48 by means of a wire 51. A stationary contact member 43 is electrically connected to the battery by means of a wire 52. It will, therefore, be seen that as the temperature rises within the room' or dwelling within which the device is placed, the thermostat spring 42 will be expanded and move laterally thereby closing the circuit with the contact member 43 and causing the bells of the bell box 49 to ring, thereby sounding the alarm. It, of course, should be understood that the device may be set to any desired or suitable tempera ture to operate the automatic fire alarm.

What is claimed is:

1. A thermostat for an automatic fire alarm, comprising a gage rack, an angle supporting bracket slidably mounted at one end upon said gage rack, a contact finger pivotally supported upon said bracket, a lever arm pivotally connected at one end to said contact finger and pivotally supported upon said angle supporting bracket, a thermometer contiguous to said bracket, and a plunger working in the upper end of said thermometer and engaging said lever arm for swinging the same upon the bracket as the temperature surrounding said thermometer varies.

2.-r-'L thermostat for an automatic fire alarm, comprising a gage rack, a supporting bracket slidably mounted at one end upon said rack, said bracket provided with an upwardly extending extension near one end, a lever pivotally mounted at its middle upon said upwardly extending extension, a standard carried by said bracket near its middle, a contact finger pivotally mounted upon said standard and pivotally connected at one end to the inner end of said lever, said bracket provided with an inwardly extondin g spacing lug near the upwardly extending extension thereof, a thermometer positioned contignone to said bracket, and a plunger working in the upper end of said thermometer and pivotally connected to the outer end of said lever for swinging the lever and said contact finger as the l'iillPQltiidlli. surrounding said device varies.

In testimony whereof I hereunto allix my signature.

WILBERT PRYOR.

Copies of'this patent may be obtained for five cents each. by addressing the Commissioner of Patent, Washington, D. (3. 

